Method for fabricating oxide superconducting coatings

Abstract

A copper substrate is immersed into a solution in which a Y-Ba-Cu-O series oxide superconducting fine powder is dispersed into an acetone solution and an electric field is applied thereto. A coating deposited on the copper substrate by electrophoresis is sintered with high temperature in vacuum or in an inert gas atmosphere and then subjected to heat-treatment for oxygen composition ratio in an atmosphere of oxygen or air under 500° C. This method prevents occurrence of a CuO layer, which would conventionally be formed at an interface between a Y-Ba-Cu-O film and a Cu substrate disadvantageously, and moreover enables fabrication of superconducting coatings having satisfactory characteristics.

What is claimed is: 
     
       1. A method for fabricating oxide superconducting coatings comprising the steps of: immersing a substrate having a copper electrode formed thereon into a solution comprising an oxide superconducting fine powder that is dispersed in an organic solvent;   sintering a deposited film of said oxide superconducting fine powder formed on said electrode by electrophoresis in a vacuum or an atmosphere of an inert gas; and   subsequently heat-treating the sintered film so as to control an oxygen composition ratio in an atmosphere of oxygen or in an atmosphere containing oxygen.   
     
     
       2. The method for fabricating oxide superconducting coatings as claimed in claim 1, wherein the heat-treatment temperature for controlling the oxygen composition ratio is under 500° C. and over 300° C. 
     
     
       3. The method for fabricating superconducting coatings as claimed in claim 1, wherein said superconducting fine powder comprises a Y-Ba-Cu-O series oxide superconducting fine powder. 
     
     
       4. The method for fabricating superconducting coatings as claimed in claim 2, wherein said superconducting fine powder comprises a Y-Ba-Cu-O series oxide superconducting fine powder.